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LEGO models my own creation MOCpages toys shop Centrifugal water pump version 2Technic
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Centrifugal water pump version 2
Based on previous pump, much improved version. Bigger, better and wetter.
About this creation




XL-motor, protected with (almost) waterproof panels.


Pump case and gearings.


Using 21 tooth gear instead 15 tooth gear should give more pumping
but V2 leaked too, didnt even pump anything at first trial !

Redesigning and covering those gaps with tape help a lot. especially those lego panels leaks a lot. Inside pump i used tape to make upper half round and clean.

While old one pumped 4,0 liter/min, this one does 6,0 liter/min. And it does it with higher discharge-pipe.
XL-motor has power enough, but revving slowly, therefore it is upgeared to 9:1.
220 rpm * 9 = 1980 and with load 1200-1500rpm

But, I checked XL-motor performance. Using a voltage meter and a separate power supply I made some tests.
I found out, that lego power-supply and wires are too weak. XL-motor was running on 7,1 volts on motor end, which is too little. It is supposed to run with 9V.
So I used my own power supply and set voltage to 9,0 volts on motor end. On that voltage XL-motor takes 0,9 amps.
Result was 0,3 liters under 2 secs, makes about 9-10 liters/min, quite a achiement.
But i'm afraid of overheating ... 9 watts may be too much for XL.
But this proves that pump design is capable up to 10 liters/min.
Next trial was to try higher discharge pipe, 25 cm/10 inches. It does still 6L/min.

Pump case, perfectly round and smooth.


Upper half of chamber, covered with tape.


Water intake is shaped with those black wedges.


Pump in pieces.


Impeller running fast


BUt since these old type big gears are rare, i tried to make a modern version


Adjustable wing length


And running fast. Works fine and pumping even better, but requires more power.....


Pump core, see the intake wedge shape


And an Quad-pump, capable of pumping 25-40 liters/min !!


Final product will be a Gigantic Deca-pump, with 1+ Liter / second capacity !!
Just in case, if anyone needs this ;)



And because dull pictures don't show how this pump works, so enjoy my little wet video ;)




Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  May 18, 2016
Quoting Judson Swets This is great! I just have one question... Where did you get the lego impeller?
From my old stock... You can buy it from Bricklink: http://alpha.bricklink.com/pages/clone/catalogitem.page?P=g21#T=C
 I like it 
  May 13, 2016
This is great! I just have one question... Where did you get the lego impeller?
 I made it 
  December 10, 2015
Quoting Kyle Ralph Where is the tape
The rule is simple. Where is leak, there is tape ;)
 I like it 
  December 9, 2015
Where is the tape
 I made it 
  November 24, 2015
Quoting Kyle Ralph what glass pieces did you use for the almost waterproof motor protector
30562 Trans-Light Blue Cylinder Quarter 4 x 4 x 6 It's not must, but looks good ;)
 I like it 
  November 22, 2015
what glass pieces did you use for the almost waterproof motor protector
 I made it 
  July 23, 2015
Quoting Hunter Dobbs This is amazing! The pump looks like it can produce a nice flow without too many leaks, and it really makes you think what kind of water effects you could add to a layout.
Lego bricks have 0,1 mm gap and it's enough for water to leak. The exit pipe is covered with tape, because of leaking panels.
 I like it 
  July 21, 2015
This is amazing! The pump looks like it can produce a nice flow without too many leaks, and it really makes you think what kind of water effects you could add to a layout.
 I like it 
  April 22, 2014
wow!:D
 I like it 
  April 21, 2014
Fantastic!
 
By re465 .
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LEGO models my own creation MOCpages toys shop Centrifugal water pump version 2Technic


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